// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_TOUCHSCREEN_PINCH_GESTURE_H_
#define CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_TOUCHSCREEN_PINCH_GESTURE_H_

#include "base/macros.h"
#include "base/time/time.h"
#include "content/browser/renderer_host/input/synthetic_gesture.h"
#include "content/browser/renderer_host/input/synthetic_gesture_target.h"
#include "content/browser/renderer_host/input/synthetic_pointer_driver.h"
#include "content/common/content_export.h"
#include "content/common/input/synthetic_pinch_gesture_params.h"
#include "content/common/input/synthetic_web_input_event_builders.h"
#include "third_party/WebKit/public/platform/WebInputEvent.h"

namespace content {

class CONTENT_EXPORT SyntheticTouchscreenPinchGesture
    : public SyntheticGesture {
public:
    explicit SyntheticTouchscreenPinchGesture(
        const SyntheticPinchGestureParams& params);
    ~SyntheticTouchscreenPinchGesture() override;

    SyntheticGesture::Result ForwardInputEvents(
        const base::TimeTicks& timestamp,
        SyntheticGestureTarget* target) override;

private:
    enum GestureState { SETUP,
        STARTED,
        MOVING,
        DONE };

    void ForwardTouchInputEvents(const base::TimeTicks& timestamp,
        SyntheticGestureTarget* target);

    void PressTouchPoints(SyntheticGestureTarget* target,
        const base::TimeTicks& timestamp);
    void MoveTouchPoints(SyntheticGestureTarget* target,
        float delta,
        const base::TimeTicks& timestamp);
    void ReleaseTouchPoints(SyntheticGestureTarget* target,
        const base::TimeTicks& timestamp);

    void SetupCoordinatesAndStopTime(SyntheticGestureTarget* target);
    float GetDeltaForPointer0AtTime(const base::TimeTicks& timestamp) const;
    base::TimeTicks ClampTimestamp(const base::TimeTicks& timestamp) const;
    bool HasReachedTarget(const base::TimeTicks& timestamp) const;

    SyntheticPinchGestureParams params_;
    std::unique_ptr<SyntheticPointerDriver> synthetic_pointer_driver_;
    float start_y_0_;
    float start_y_1_;
    float max_pointer_delta_0_;
    SyntheticGestureParams::GestureSourceType gesture_source_type_;
    GestureState state_;
    base::TimeTicks start_time_;
    base::TimeTicks stop_time_;

private:
    DISALLOW_COPY_AND_ASSIGN(SyntheticTouchscreenPinchGesture);
};

} // namespace content

#endif // CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_TOUCHSCREEN_PINCH_GESTURE_H_
